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  <div id="layout-content"><div id="function.imageinterlace" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">imageinterlace</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">imageinterlace</span> &mdash; <span class="dc-title">启用或禁用隔行扫描</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.imageinterlace-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>imageinterlace</strong></span>(<span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>, <span class="methodparam"><span class="type">int</span> <code class="parameter">$interlace</code><span class="initializer"> = 0</span></span>): <span class="type">int</span></div>

  <p class="para rdfs-comment">
   <span class="function"><strong>imageinterlace()</strong></span> 打开或关闭隔行扫描位（bit）。
  </p>
  <p class="para">
   如果设置了隔行扫描位（interlace bit），对于 <abbr title="Joint Photographic Experts Group">JPEG</abbr> 图像，会被创建为渐进式 <abbr title="Joint Photographic Experts Group">JPEG</abbr> 图像。
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-function.imageinterlace-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    <dt>

<code class="parameter">image</code></dt>
<dd>
<p class="para">由图象创建函数(例如<span class="function"><a href="function.imagecreatetruecolor.html" class="function">imagecreatetruecolor()</a></span>)返回的 
<span class="classname"><a href="class.gdimage.html" class="classname">GdImage</a></span> 对象。</p></dd>

    
     <dt>
<code class="parameter">interlace</code></dt>

     <dd>

      <p class="para">
       如果为 0 ，则关闭隔行扫描，否则将打开隔行扫描。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.imageinterlace-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   如果为图像设置了隔行扫描，则返回 1 ，否则返回 0 。
  </p>
 </div>

 <div class="refsect1 examples" id="refsect1-function.imageinterlace-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-2687">
    <p><strong>示例 #1 使用 <span class="function"><strong>imageinterlace()</strong></span> 打开隔行扫描</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">//&nbsp;创建一个图像实例<br /></span><span style="color: #0000BB">$im&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">imagecreatefromgif</span><span style="color: #007700">(</span><span style="color: #DD0000">'php.gif'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;打开隔行扫描<br /></span><span style="color: #0000BB">imageinterlace</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">true</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;保存图像<br /></span><span style="color: #0000BB">imagegif</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'./php_interlaced.gif'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
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